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There is an awful lot posted about observatories, pier isolation and vibration problems. A lot of people use huge foundations for their piers and in most cases it isn't required. A good solid pier is much more important.
My observatory pier is a hole in the ground 4 ft deeoabout 8" to 10" square with the 6" pier sitting in the bottom and the remainder of the hole filled with concrete. Not much really.
In your case I would sugest a solid pier with a solid large base positively anchored to the top of the tank well and you shouldn't have any problems. I image with mine and have no problems with movement or vibration without a huge mass of concrete.
The height of the pier will be a much bigger problem with the vibration than the base it is bolted to.
Good luck with it all. Sounds great to me.
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